
 Fix test 21 -- the attribute value is the actual PMC, not a copy
 Also fix tests that were doing evil things to attribute slots 0 & 1


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@5421 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot